<div class="container">
    <div class="row">
        <div class="col-md-3 col-xs-3 col-sm-3"></div>
            <div class="col-md-4 col-xs-6 col-sm-6">
                <form class="form-signin" role="form">
                    <h2 style="margin-left:140px" class="form-signin-heading">注册</h2>
                    <input id="czm1" type="email" class="form-control" placeholder="用户名" required="" autofocus="">
                    <br>
                    <input id="czm2" type="password" class="form-control" placeholder="密码" required="">
                    <br>
                    <input type="email" class="form-control" placeholder="请再次输入" required="" autofocus="">
                    <br>
                    <input type="email" class="form-control" placeholder="请输入邮箱" required="" autofocus="">
                    <br>
                    <button style="margin-left:100px" class="btn btn-lg btn-primary btn-success" type="submit">点击立即注册</button>
                </form>
            </div>  
        <div class="col-md-5 col-xs-3 col-sm-3"></div>
    </div>
</div>